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/*
* Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include <openssl/asn1t.h>
#include <openssl/core_names.h>
#include <openssl/core_object.h>
#include <openssl/params.h>
#include <openssl/x509.h>
#include "internal/sizes.h"
#include "crypto/x509.h"
#include "crypto/ec.h"
#include "prov/bio.h"
#include "prov/implementations.h"
#include "endecoder_local.h"
static OSSL_FUNC_decoder_newctx_fn spki2typespki_newctx;
static OSSL_FUNC_decoder_freectx_fn spki2typespki_freectx;
static OSSL_FUNC_decoder_decode_fn spki2typespki_decode;
static OSSL_FUNC_decoder_settable_ctx_params_fn spki2typespki_settable_ctx_params;
static OSSL_FUNC_decoder_set_ctx_params_fn spki2typespki_set_ctx_params;
/*
* Context used for SubjectPublicKeyInfo to Type specific SubjectPublicKeyInfo
* decoding.
*/
struct spki2typespki_ctx_st {
PROV_CTX *provctx;
char propq[OSSL_MAX_PROPQUERY_SIZE];
};
static void *spki2typespki_newctx(void *provctx)
{
struct spki2typespki_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
ctx->provctx = provctx;
return ctx;
}
static void spki2typespki_freectx(void *vctx)
{
struct spki2typespki_ctx_st *ctx = vctx;
OPENSSL_free(ctx);
}
static const OSSL_PARAM *spki2typespki_settable_ctx_params(ossl_unused void *provctx)
{
static const OSSL_PARAM settables[] = {
OSSL_PARAM_utf8_string(OSSL_DECODER_PARAM_PROPERTIES, NULL, 0),
OSSL_PARAM_END
};
return settables;
}
static int spki2typespki_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
struct spki2typespki_ctx_st *ctx = vctx;
const OSSL_PARAM *p;
char *str = ctx->propq;
p = OSSL_PARAM_locate_const(params, OSSL_DECODER_PARAM_PROPERTIES);
if (p != NULL && !OSSL_PARAM_get_utf8_string(p, &str, sizeof(ctx->propq)))
return 0;
return 1;
}
static int spki2typespki_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
struct spki2typespki_ctx_st *ctx = vctx;
unsigned char *der, *derp;
long len;
int ok = 0;
int objtype = OSSL_OBJECT_PKEY;
X509_PUBKEY *xpub = NULL;
X509_ALGOR *algor = NULL;
const ASN1_OBJECT *oid = NULL;
char dataname[OSSL_MAX_NAME_SIZE];
OSSL_PARAM params[5], *p = params;
if (!ossl_read_der(ctx->provctx, cin, &der, &len))
return 1;
derp = der;
xpub = ossl_d2i_X509_PUBKEY_INTERNAL((const unsigned char **)&derp, len,
PROV_LIBCTX_OF(ctx->provctx),
ctx->propq);
if (xpub == NULL) {
/* We return "empty handed". This is not an error. */
ok = 1;
goto end;
}
if (!X509_PUBKEY_get0_param(NULL, NULL, NULL, &algor, xpub))
goto end;
X509_ALGOR_get0(&oid, NULL, NULL, algor);
#ifndef OPENSSL_NO_EC
/* SM2 abuses the EC oid, so this could actually be SM2 */
if (OBJ_obj2nid(oid) == NID_X9_62_id_ecPublicKey
&& ossl_x509_algor_is_sm2(algor))
strcpy(dataname, "SM2");
else
#endif
if (OBJ_obj2txt(dataname, sizeof(dataname), oid, 0) <= 0)
goto end;
ossl_X509_PUBKEY_INTERNAL_free(xpub);
xpub = NULL;
*p++ =
OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
dataname, 0);
*p++ =
OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_STRUCTURE,
"SubjectPublicKeyInfo",
0);
*p++ =
OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_DATA, der, len);
*p++ =
OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &objtype);
*p = OSSL_PARAM_construct_end();
ok = data_cb(params, data_cbarg);
end:
ossl_X509_PUBKEY_INTERNAL_free(xpub);
OPENSSL_free(der);
return ok;
}
const OSSL_DISPATCH ossl_SubjectPublicKeyInfo_der_to_der_decoder_functions[] = {
{ OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))spki2typespki_newctx },
{ OSSL_FUNC_DECODER_FREECTX, (void (*)(void))spki2typespki_freectx },
{ OSSL_FUNC_DECODER_DECODE, (void (*)(void))spki2typespki_decode },
{ OSSL_FUNC_DECODER_SETTABLE_CTX_PARAMS,
(void (*)(void))spki2typespki_settable_ctx_params },
{ OSSL_FUNC_DECODER_SET_CTX_PARAMS,
(void (*)(void))spki2typespki_set_ctx_params },
OSSL_DISPATCH_END
};
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